A patch for the PC version of Ace Combat: Assault Horizon Enhanced Edition
is now available replacing Games for Windows Live functionalities with Steamworks functionalities. If you played or are currently playing the game, you will be able to update and keep your achievements and saves between February 24th and April 1st. From April 1st, the new version using Steamworks functionalities will become the default version of the game.
Visit this page
for info on how you can apply this patch.